import Data from '../modules/Data'
import AxesUtils from '../modules/axes/AxesUtils'
import Series from '../modules/Series'
import Utils from '../utils/Utils'

class Exports {
  constructor(ctx) {
    this.ctx = ctx
    this.w = ctx.w
  }

  fixSvgStringForIe11(svgData) {
    // IE11 generates broken SVG that we have to fix by using regex
    if (!Utils.isIE11()) {
      // not IE11 - noop
      return svgData
    }

    // replace second occurrence of "xmlns" attribute with "xmlns:xlink" with correct url + add xmlns:svgjs
    let nXmlnsSeen = 0
    let result = svgData.replace(
      /xmlns="http:\/\/www.w3.org\/2000\/svg"/g,
      (match) => {
        nXmlnsSeen++
        return nXmlnsSeen === 2
          ? 'xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svgjs="http://svgjs.com/svgjs"'
          : match
      }
    )

    // remove the invalid empty namespace declarations
    result = result.replace(/xmlns:NS\d+=""/g, '')
    // remove these broken namespaces from attributes
    result = result.replace(/NS\d+:(\w+:\w+=")/g, '$1')

    return result
  }

  getSvgString() {
    const svgString = this.w.globals.dom.Paper.svg()
    return this.fixSvgStringForIe11(svgString)
  }

  cleanup() {
    const w = this.w

    // hide some elements to avoid printing them on exported svg
    const xcrosshairs = w.globals.dom.baseEl.getElementsByClassName(
      'apexcharts-xcrosshairs'
    )
    const ycrosshairs = w.globals.dom.baseEl.getElementsByClassName(
      'apexcharts-ycrosshairs'
    )
    const zoomSelectionRects = w.globals.dom.baseEl.querySelectorAll(
      '.apexcharts-zoom-rect, .apexcharts-selection-rect'
    )
    Array.prototype.forEach.call(zoomSelectionRects, (z) => {
      z.setAttribute('width', 0)
    })
    if (xcrosshairs && xcrosshairs[0]) {
      xcrosshairs[0].setAttribute('x', -500)
      xcrosshairs[0].setAttribute('x1', -500)
      xcrosshairs[0].setAttribute('x2', -500)
    }
    if (ycrosshairs && ycrosshairs[0]) {
      ycrosshairs[0].setAttribute('y', -100)
      ycrosshairs[0].setAttribute('y1', -100)
      ycrosshairs[0].setAttribute('y2', -100)
    }
  }

  svgUrl() {
    this.cleanup()

    const svgData = this.getSvgString()
    const svgBlob = new Blob([svgData], { type: 'image/svg+xml;charset=utf-8' })
    return URL.createObjectURL(svgBlob)
  }

  dataURI() {
    return new Promise((resolve) => {
      const w = this.w

      this.cleanup()
      const canvas = document.createElement('canvas')
      canvas.width = w.globals.svgWidth
      canvas.height = parseInt(w.globals.dom.elWrap.style.height, 10) // because of resizeNonAxisCharts

      const canvasBg =
        w.config.chart.background === 'transparent'
          ? '#fff'
          : w.config.chart.background

      let ctx = canvas.getContext('2d')
      ctx.fillStyle = canvasBg
      ctx.fillRect(0, 0, canvas.width, canvas.height)

      const svgData = this.getSvgString()

      if (window.canvg && Utils.isIE11()) {
        // use canvg as a polyfill to workaround ie11 considering a canvas with loaded svg 'unsafe'
        // without ignoreClear we lose our background color; without ignoreDimensions some grid lines become invisible
        let v = window.canvg.Canvg.fromString(ctx, svgData, {
          ignoreClear: true,
          ignoreDimensions: true
        })
        // render the svg to canvas
        v.start()

        let blob = canvas.msToBlob()
        // dispose - missing this will cause a memory leak
        v.stop()

        resolve({ blob })
      } else {
        const svgUrl = 'data:image/svg+xml,' + encodeURIComponent(svgData)
        let img = new Image()
        img.crossOrigin = 'anonymous'

        img.onload = () => {
          ctx.drawImage(img, 0, 0)

          if (canvas.msToBlob) {
            // IE and Edge can't navigate to data urls, so we return the blob instead
            let blob = canvas.msToBlob()
            resolve({ blob })
          } else {
            let imgURI = canvas.toDataURL('image/png')
            resolve({ imgURI })
          }
        }

        img.src = svgUrl
      }
    })
  }

  exportToSVG() {
    this.triggerDownload(
      this.svgUrl(),
      this.w.config.chart.toolbar.export.svg.filename,
      '.svg'
    )
  }

  exportToPng() {
    this.dataURI().then(({ imgURI, blob }) => {
      if (blob) {
        navigator.msSaveOrOpenBlob(blob, this.w.globals.chartID + '.png')
      } else {
        this.triggerDownload(
          imgURI,
          this.w.config.chart.toolbar.export.png.filename,
          '.png'
        )
      }
    })
  }

  exportToCSV({ series, columnDelimiter, lineDelimiter = '\n' }) {
    const w = this.w

    let columns = []
    let rows = []
    let result = 'data:text/csv;charset=utf-8,'

    const isTimeStamp = (num) => {
      return w.config.xaxis.type === 'datetime' && String(num).length >= 10
    }
    const dataFormat = new Data(this.ctx)

    const axesUtils = new AxesUtils(this.ctx)
    const getCat = (i) => {
      let cat = ''

      // pie / donut/ radial
      if (!w.globals.axisCharts) {
        cat = w.config.labels[i]
      } else {
        // xy charts

        // non datetime
        if (
          w.config.xaxis.type === 'category' ||
          w.config.xaxis.convertedCatToNumeric
        ) {
          if (w.globals.isBarHorizontal) {
            let lbFormatter = w.globals.yLabelFormatters[0]
            let sr = new Series(this.ctx)
            let activeSeries = sr.getActiveConfigSeriesIndex()

            cat = lbFormatter(w.globals.labels[i], {
              seriesIndex: activeSeries,
              dataPointIndex: i,
              w
            })
          } else {
            cat = axesUtils.getLabel(
              w.globals.labels,
              w.globals.timescaleLabels,
              0,
              i
            ).text
          }
        }

        // datetime, but labels specified in categories or labels
        if (w.config.xaxis.type === 'datetime') {
          if (w.config.xaxis.categories.length) {
            cat = w.config.xaxis.categories[i]
          } else if (w.config.labels.length) {
            cat = w.config.labels[i]
          }
        }
      }

      return Utils.isNumber(cat) ? cat : cat.split(columnDelimiter).join('')
    }

    const handleAxisRowsColumns = (s, sI) => {
      if (columns.length && sI === 0) {
        rows.push(columns.join(columnDelimiter))
      }

      if (s.data && s.data.length) {
        for (let i = 0; i < s.data.length; i++) {
          columns = []

          let cat = getCat(i)
          if (!cat) {
            if (dataFormat.isFormatXY()) {
              cat = series[sI].data[i].x
            } else if (dataFormat.isFormat2DArray()) {
              cat = series[sI].data[i] ? series[sI].data[i][0] : ''
            }
          }

          if (sI === 0) {
            columns.push(
              isTimeStamp(cat)
                ? w.config.chart.toolbar.export.csv.dateFormatter(cat)
                : cat.split(columnDelimiter).join('')
            )

            for (let ci = 0; ci < w.globals.series.length; ci++) {
              columns.push(w.globals.series[ci][i])
            }
          }

          if (
            w.config.chart.type === 'candlestick' ||
            (s.type && s.type === 'candlestick')
          ) {
            columns.pop()
            columns.push(w.globals.seriesCandleO[sI][i])
            columns.push(w.globals.seriesCandleH[sI][i])
            columns.push(w.globals.seriesCandleL[sI][i])
            columns.push(w.globals.seriesCandleC[sI][i])
          }
          if (w.config.chart.type === 'rangeBar') {
            columns.pop()
            columns.push(w.globals.seriesRangeStart[sI][i])
            columns.push(w.globals.seriesRangeEnd[sI][i])
          }

          if (columns.length) {
            rows.push(columns.join(columnDelimiter))
          }
        }
      }
    }

    columns.push(w.config.chart.toolbar.export.csv.headerCategory)
    series.map((s, sI) => {
      const sname = s.name ? s.name : `series-${sI}`
      if (w.globals.axisCharts) {
        columns.push(
          sname.split(columnDelimiter).join('')
            ? sname.split(columnDelimiter).join('')
            : `series-${sI}`
        )
      }
    })

    if (!w.globals.axisCharts) {
      columns.push(w.config.chart.toolbar.export.csv.headerValue)
      rows.push(columns.join(columnDelimiter))
    }
    series.map((s, sI) => {
      if (w.globals.axisCharts) {
        handleAxisRowsColumns(s, sI)
      } else {
        columns = []

        columns.push(w.globals.labels[sI].split(columnDelimiter).join(''))
        columns.push(w.globals.series[sI])
        rows.push(columns.join(columnDelimiter))
      }
    })

    result += rows.join(lineDelimiter)

    this.triggerDownload(
      encodeURI(result),
      w.config.chart.toolbar.export.csv.filename,
      '.csv'
    )
  }

  triggerDownload(href, filename, ext) {
    const downloadLink = document.createElement('a')
    downloadLink.href = href
    downloadLink.download = (filename ? filename : this.w.globals.chartID) + ext
    document.body.appendChild(downloadLink)
    downloadLink.click()
    document.body.removeChild(downloadLink)
  }
}

export default Exports
